Acoustic beam steering by light refraction: Illustration with directivity patterns of a tilted volume photoacoustic source - Le Mans Université Accéder directement au contenu
Article Dans Une Revue Journal of the Acoustical Society of America Année : 2013

Acoustic beam steering by light refraction: Illustration with directivity patterns of a tilted volume photoacoustic source

Résumé

The symmetry of a thermoelastic source resulting from laser absorption can be broken when the direction of light propagation in an elastic half-space is inclined relatively to the surface. This leads to an asymmetry of the directivity patterns of both compressional and shear acoustic waves. In contrast to classical surface acoustic sources, the tunable volume source allows one to take advantage of the mode conversion at the surface to control the directivity of specific modes. Physical interpretations of the evolution of the directivity patterns with the increasing light angle of incidence and of the relations between the preferential directions of compres-sional-and shear-wave emission are proposed. In order to compare calculated directivity patterns with measurements of normal displacement amplitudes performed on plates, a procedure is proposed to transform the directivity patterns into pseudo-directivity patterns representative of the experimental conditions. The comparison of the theoretical with measured pseudo-directivity patterns demonstrates the ability to enhance bulk-wave amplitudes and to steer specific bulk acoustic modes by adequately tuning light refraction.
Fichier principal
Vignette du fichier
Raetz2013_v134_p4381--4392.pdf (1.36 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte
Loading...

Dates et versions

hal-01889418 , version 1 (09-10-2018)

Identifiants

Citer

Samuel Raetz, Thomas Dehoux, Mathieu Perton, Bertrand Audoin. Acoustic beam steering by light refraction: Illustration with directivity patterns of a tilted volume photoacoustic source. Journal of the Acoustical Society of America, 2013, 134 (6), pp.4381 - 4392. ⟨10.1121/1.4828825⟩. ⟨hal-01889418⟩
110 Consultations
189 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More